Year	% of total primary
1970	12.0409803390503
1971	12.0162000656128
1972	11.7109699249268
1973	11.3970203399658
1974	11.6592102050781
1975	11.7867097854614
1976	11.883810043335
1977	11.6002197265625
1978	11.305760383606
1979	11.000189781189
1980	10.8030300140381
1981	10.5310497283936
1982	10.2501096725464
1983	9.98077964782715
1984	9.69661045074463
1985	9.49497985839844
1986	9.29994964599609
1987	9.22797966003418
1988	9.2907600402832
1989	9.43144989013672
1990	9.52017974853516
1991	9.07166957855225
1992	9.08360004425049
1993	9.15067958831787
1994	9.086669921875
1995	9.82536029815674
1996	9.97966957092285
1997	9.99026012420654
1998	9.96572971343994
1999	9.90818977355957
2000	9.78454971313477
2001	9.69913005828857
2002	9.61443042755127
2003	9.51580047607422
2004	9.42702960968018
2005	9.34807968139648
2006	9.25776958465576
2007	9.17835998535156
2008	9.09165954589844
2009	9.07604026794434
2010	8.94688034057617
2011	8.86944961547852
2012	9.01399040222168
2013	9.24816036224365
2014	9.44386959075928
2015	9.8305196762085
2016	10.2889795303345
2017	10.6196002960205
2018	10.8855895996094
2019	11.1943998336792
2020	11.2194900512695
2021	11.7608995437622
2022	11.8153200149536